Oracle Forms

i am debugging a form that is using Tool_Env.Getvar() built-in package procedure. the form is throwing an error that it could not recognize the directory because it does not exists anymore. i want to change the parameter to reflect to the new directory and i came across this line of code:

    Procedure [procedure name] Is
      hard_path     varchar2(100);
      ...
    begin
      ...
      Tool_Env.Getvar('OUTPUT_DOC_DIR', hard_path);
      ...
    end;

where i could not figure out where i can find OUTPUT_DOC_DIR to change it's value?

thanks,
warren